import org.apache.flink.api.common.eventtime.SerializableTimestampAssigner;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.tuple.Tuple4;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.co.CoProcessFunction;
import org.apache.flink.util.Collector;

public class BillCheckExample {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);


        // 来自 app的支付日志
        SingleOutputStreamOperator<Tuple3<String, String, Long>> appStream = env.fromElements(Tuple3.of("order-1", "app", 1000L), Tuple3.of("order-2", "app", 2000L)).assignTimestampsAndWatermarks(WatermarkStrategy.<Tuple3<String, String, Long>>forMonotonousTimestamps().withTimestampAssigner(new SerializableTimestampAssigner<Tuple3<String, String, Long>>() {
            public long extractTimestamp(Tuple3<String, String, Long> element, long l) {
                return element.f2;
            }
        }));

        SingleOutputStreamOperator<Tuple4<String, String, String, Long>> thirdPayStream = env.fromElements(Tuple4.of("order-1", "third-party", "success", 3000L), Tuple4.of("order-3", "third-party", "success", 4000L)).assignTimestampsAndWatermarks(WatermarkStrategy.<Tuple4<String, String, String, Long>>forMonotonousTimestamps().withTimestampAssigner(new SerializableTimestampAssigner<Tuple4<String, String, String, Long>>() {
            @Override
            public long extractTimestamp(Tuple4<String, String, String, Long> element, long l) {
                return element.f3;
            }
        }));

        appStream.connect(thirdPayStream).keyBy(data -> data.f0, data -> data.f0).process(new OrderMatchResult()).print();

        env.execute();

    }

    // 自定义实现 CoProcessFunction
    public static class OrderMatchResult extends CoProcessFunction<Tuple3<String, String, Long>, Tuple4<String, String, String, Long>, String> {
        // 定义状态变量，用来保存已经到达的事件
        private ValueState<Tuple3<String, String, Long>> appEventState;
        private ValueState<Tuple4<String, String, String, Long>> thirdPartyEventState;

        public void open(Configuration parameters) throws Exception {
            appEventState = getRuntimeContext().getState(new ValueStateDescriptor<Tuple3<String, String, Long>>("app-event",
                    Types.TUPLE(Types.STRING, Types.STRING, Types.LONG)));
            thirdPartyEventState = getRuntimeContext().getState(new ValueStateDescriptor<Tuple4<String, String, String, Long>>("thirdparty-event",
                    Types.TUPLE(Types.STRING, Types.STRING, Types.STRING, Types.LONG)));
        }

        @Override
        public void processElement1(Tuple3<String, String, Long> value, CoProcessFunction<Tuple3<String, String, Long>, Tuple4<String, String, String, Long>, String>.Context ctx, Collector<String> out) throws Exception {
// 看另一条流中事件是否来过
            if (thirdPartyEventState.value() != null) {
                out.collect(" 对 账 成 功 ： " + value + " " + thirdPartyEventState.value());
// 清空状态
                thirdPartyEventState.clear();
            } else {
// 更新状态
                appEventState.update(value);
// 注册一个 5秒后的定时器，开始等待另一条流的事件
                ctx.timerService().registerEventTimeTimer(value.f2 + 5000L);
            }
        }

        @Override
        public void processElement2(Tuple4<String, String, String, Long> value, CoProcessFunction<Tuple3<String, String, Long>, Tuple4<String, String, String, Long>, String>.Context ctx, Collector<String> out) throws Exception {
            if (appEventState.value() != null) {
                out.collect("对账成功：" + appEventState.value() + " " + value);
// 清空状态
                appEventState.clear();
            } else {
// 更新状态
                thirdPartyEventState.update(value);
// 注册一个 5秒后的定时器，开始等待另一条流的事件
                ctx.timerService().registerEventTimeTimer(value.f3 + 5000L);
            }
        }

        @Override
        public void onTimer(long timestamp,OnTimerContext ctx,Collector<String>  out) throws Exception {
            // 定时器触发，判断状态，如果某个状态不为空，说明另一条流中事件没来
            if (appEventState.value() != null) {
                out.collect("对账失败：" + appEventState.value() + " " + "第三方支付 平台信息未到");
            }

            if (thirdPartyEventState.value() != null) {
                out.collect("对账失败：" + thirdPartyEventState.value() + " " + "app信息未到");
            }

            appEventState.clear();
            thirdPartyEventState.clear();

        }


    }

}
